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Full-waveform velocity modeling inversion method based on geologic model constraints

A velocity inversion and velocity modeling technology, applied in the field of petroleum exploration, which can solve the problems that the inversion accuracy and imaging effect need to be further improved, there are convergence and multiple solutions, and the full waveform inversion method does not consider the geological structure. , to achieve the effect of improving imaging quality, inversion accuracy, and speed inversion accuracy

Active Publication Date: 2020-06-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] However, as a nonlinear problem, full waveform inversion has problems of convergence and multiple solutions. Prior information constraints must be carried out to exclude some wrong models and help the inversion results converge to the optimal solution near the prior model. The waveform inversion method does not consider the influence of geological structure, so its inversion accuracy and imaging effect in complex fault block areas need to be further improved

Method used

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  • Full-waveform velocity modeling inversion method based on geologic model constraints
  • Full-waveform velocity modeling inversion method based on geologic model constraints
  • Full-waveform velocity modeling inversion method based on geologic model constraints

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Embodiment 1

[0063] The present invention proposes a full waveform velocity modeling and inversion method based on geological structure model constraints, the process of which is as follows figure 1 As shown, it specifically includes the following steps:

[0064] Step 1: Input seismic data inversion parameters, initial velocity model, actual observation shot records, and structural interpretation data;

[0065] Step 2: Carry out forward simulation according to the initial velocity model, and obtain the forward simulation shot record and the forward wave field;

[0066] Step 3: Using the geological structure model, combined with the structural interpretation data, by constraining the regularization term of the conventional full waveform velocity inversion model, the geological structure inversion operators Γ and Λ are constructed to obtain the full waveform velocity based on the geological structure model constraint inversion model;

[0067] The conventional full waveform inversion FWI me...

Embodiment 2

[0105] A full waveform velocity modeling and inversion method based on geological structure model constraints proposed by the present invention is applied to the Marmousi model, and ideal calculation results are achieved. The Marmousi model used for testing has drastic changes in formation dip and high-speed anomalies, and the recorded seismic wavefield is dominated by complex reflection wavefields. The input initial velocity model is as follows: figure 2 As shown; the geological structure inversion operators Γ and Λ are constructed by combining the geological structure model with structural interpretation data, image 3 Shown is the structural interpretation data of this embodiment, the imaging section contains strong reflective strata and faults, and the geological structure inversion operators Γ and Λ are constructed by analyzing the contact relationship between strata and strata and between strata and faults in the interpretation data; In this embodiment, a finite-differe...

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Abstract

The invention discloses a full-waveform velocity modeling inversion method based on geological structure model constraints. The full-waveform velocity modeling inversion method comprises the steps of:inputting seismic data inversion parameters, an initial velocity model, actual observation gun records and structure interpretation data, and carrying out forward modeling according to the initial velocity model to obtain forward modeling shot records and a forward propagation wave field; constructing a geologic structure inversion operator by utilizing the geologic structure model; constrainingregularization terms of a conventional FWI inversion model; acquiring a full-waveform velocity inversion model based on the geological structure model constraints; and solving residual errors betweenall forward shot records and corresponding actual observation shot records, carrying out back propagation, calculating a single shot gradient and a total speed gradient of each shot record in combination with the forward propagation wave field, setting a test step length and a cycle index, updating the step length by utilizing the actual observation shot records, and completing iterative updatingof a speed field to obtain a speed inversion result. According to the full-waveform velocity modeling inversion method, the geological model is used as a constraint condition, the inversion effect iseffectively enhanced, the speed inversion precision is improved, and the full-waveform velocity modeling inversion method has important significance in complex fault block region exploration.

Description

technical field [0001] The invention relates to the field of petroleum exploration, in particular to a full waveform velocity modeling and inversion method based on geological model constraints. Background technique [0002] Prestack depth migration technology has achieved good imaging results in areas with severe lateral velocity changes and high-dip angle structures. However, prestack depth migration technology is sensitive to the initial velocity model, and imaging accuracy is restricted by velocity accuracy. An accurate velocity model is of great significance for improving the imaging quality. [0003] During the velocity inversion process, the velocity field is divided into low-wavenumber segments (velocity values) and high-wavenumber segments (velocity interfaces). At present, tomographic inversion and migration velocity are usually used to estimate low-wavenumber components, and the reflection interface interpretation data and Other prior information (well data, VSP ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
CPCG01V1/28G01V1/282G01V2210/70G01V2210/665
Inventor 张子良李振春张凯王非翊
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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